﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

class DigitAsWord
{
    static void Main(string[] args)
    {
        Console.WriteLine("Please, enter digit in range 0-9: ");
        byte digit;
        if (!(byte.TryParse(Console.ReadLine(), out digit)))
        {
            digit = 10;
        }
        switch (digit)
        {
            case 0: Console.WriteLine("zero"); break;
            case 1: Console.WriteLine("one"); break;
            case 2: Console.WriteLine("two"); break;
            case 3: Console.WriteLine("three"); break;
            case 4: Console.WriteLine("four"); break;
            case 5: Console.WriteLine("five"); break;
            case 6: Console.WriteLine("six"); break;
            case 7: Console.WriteLine("seven"); break;
            case 8: Console.WriteLine("eight"); break;
            case 9: Console.WriteLine("nine"); break;
            default: Console.WriteLine("not a digit"); break;
        }
    }
}
